A device for measuring dust accumulation rate of photovoltaic strings

Abstract

The present invention belongs to the technical field of photovoltaic string dust accumulation rate measurement, specifically, a photovoltaic string dust accumulation rate measurement device, comprising an upper photovoltaic panel group and a lower photovoltaic panel group, one side of the upper photovoltaic panel group and the lower photovoltaic panel group is correspondingly installed with a first inverter and a second inverter, the upper photovoltaic panel group and the lower photovoltaic panel group are fixedly installed on the upper side of an adjustment component, one side of the upper photovoltaic panel group is installed with an upper string protection member, and one side of the lower photovoltaic panel group is installed with a lower string protection member, the upper photovoltaic panel group and the lower photovoltaic panel group are angle-adjusted by the adjustment component, the inclination angle at this time is different from the first inclination angle, and data measurement is performed at this time, the first group of data is the total power generation efficiency of the first inverter and the second inverter that are cleaned every day, and the second group of data is the total power generation efficiency of the first inverter and the second inverter that are not cleaned, and the influence on the dust accumulation rate is measured by comparing the dust accumulation rates of the upper photovoltaic panel group and the lower photovoltaic panel group at two different inclination angles.

Description

Technical Field

[0001] The invention belongs to the field of photovoltaic string dust accumulation rate measurement, in particular to a photovoltaic string dust accumulation rate measurement device. Background Art

[0002] Photovoltaic panels are installed in strings. An array formed by multiple photovoltaic panels is a string. The photovoltaic panels in the array are connected to the positive and negative poles, and a wiring harness connected to the inverter is connected in series. During daily use, dust will fall on the surface of the photovoltaic strings. The dust covering the surface of the photovoltaic panels will affect the working efficiency of the photovoltaic panels, because the dust on the surface of the photovoltaic components will reduce its photoelectric conversion efficiency and affect the power generation of the photovoltaic power station. The traditional method of measuring the dust accumulation rate is to use the inverter to detect the power generation rate of a group of photovoltaic strings that are frequently de-dusted, and then use the inverter to detect the power generation rate of another group of photovoltaic strings that are not de-dusted, so as to determine the dust accumulation rate of the photovoltaic strings.

[0003] A patent document with publication number CN113572426A discloses a method and device for determining the dust accumulation rate of components based on a string inverter. According to preset rules, a first photovoltaic string and a second photovoltaic string connected to the string inverter are selected as an experimental control group for dust accumulation rate determination; the first photovoltaic string is cleaned at first preset time intervals, and the second photovoltaic string is not processed; the daily power difference rate between the first photovoltaic string and the second photovoltaic string is calculated; and, the daily power difference rate between the first photovoltaic string and the second photovoltaic string is analyzed, and the dust accumulation rate of the components is predicted based on the analysis results.

[0004] In the above technical scheme, after cleaning a group of photovoltaic strings separately, the power generation efficiency after cleaning is compared with the power generation efficiency of other uncleaned photovoltaic strings. The dust accumulation rate of the photovoltaic strings is calculated after comparison, which is used to detect the dust accumulation rate of the photovoltaic strings under the same state. The square array formed by the photovoltaic strings usually has an inclination angle, and different inclination angles will affect the dust accumulation rate. However, the comparison method in the traditional technical scheme is different photovoltaic strings at the same inclination angle, which is not convenient for measuring the dust accumulation rate of photovoltaic strings with different inclination angles to analyze the degree of influence of dust accumulation.

[0005] To this end, the present invention provides a device for measuring the dust accumulation rate of a photovoltaic string. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a photovoltaic string dust accumulation rate measuring device described in the present invention comprises an upper photovoltaic panel group and a lower photovoltaic panel group, one side of the upper photovoltaic panel group and the lower photovoltaic panel group is correspondingly installed with a first inverter and a second inverter, the upper photovoltaic panel group and the lower photovoltaic panel group are fixedly installed on the upper side of the adjustment component, one side of the upper photovoltaic panel group is installed with an upper string protection member, and one side of the lower photovoltaic panel group is installed with a lower string protection member;

[0008] A plurality of fixing bars are installed on the lower sides of the upper photovoltaic panel group and the lower photovoltaic panel group, and the lower sides of the plurality of fixing bars are fixedly connected to the adjustment component. A first group of string bars is fixedly installed on the lower side of the upper photovoltaic panel group, and a lower photovoltaic wiring harness is installed inside the first group of string bars, and the lower photovoltaic wiring harness is electrically connected to the lower photovoltaic panel group. A second group of string bars is fixedly installed on the lower side of the upper photovoltaic panel group, and an upper photovoltaic wiring harness is installed inside the second group of string bars, and the upper photovoltaic wiring harness is electrically connected to the upper photovoltaic panel group. The second group of string bars and the first group of string bars are fixedly connected to the adjustment component.

[0009] Preferably, the adjustment assembly includes an inclined bar fixedly connected to a plurality of fixed bars, and a fixed assembly and a lifting assembly installed on the lower side of the inclined bar, and a through-bar groove is opened through the interior of the inclined bar.

[0010] Preferably, the lifting assembly includes an extending and lowering column and a U-shaped member fixedly installed on the upper end of the extending and lowering column, a sliding column is installed inside the U-shaped member, and the sliding column is located inside the through-slot.

[0011] Preferably, the fixed component includes a U-shaped column and a rotating shaft movably installed inside the U-shaped column, a rotating bar movably installed inside the U-shaped column, the rotating bar is movably installed inside the U-shaped column through the rotating shaft, a U-shaped fixing block is fixedly installed on the upper end of the rotating bar, and the U-shaped fixing block is fixedly installed with the corresponding tilting bar.

[0012] Preferably, the lower string protection member comprises a Z-shaped protection sleeve, and the Z-shaped protection sleeve is used to protect the lower photovoltaic wiring harness, and one end of the lower photovoltaic wiring harness is electrically connected to the second inverter.

[0013] Preferably, the upper string protection part includes an L-shaped thick protective cover and an L-shaped protective cover movably installed at the lower end of the L-shaped thick protective cover, one end of the L-shaped protective cover is embedded in the lower end of the L-shaped thick protective cover, and a thin protective cover is fixedly installed at one end of the L-shaped thick protective cover, and the upper photovoltaic wiring harness is located inside the thin protective cover, the L-shaped thick protective cover and the L-shaped protective cover.

[0014] Preferably, two electric telescopic columns are fixedly installed at the lower end of the L-shaped thick protective sleeve, and the two electric telescopic columns are located outside the upper end of the L-shaped protective sleeve. The two electric telescopic columns are used for lifting and lowering the L-shaped thick protective sleeve as a whole.

[0015] Preferably, a fixing groove is provided inside the L-shaped protective sleeve, the thickness of the fixing groove is consistent with the upper photovoltaic wiring harness, the upper photovoltaic wiring harness is fixedly installed inside the fixing groove, and a stabilizing block is movably installed outside the L-shaped protective sleeve.

[0016] Preferably, a plurality of telescopic components are installed inside the L-shaped thick protective sleeve, and the plurality of telescopic components are staggeredly distributed inside the L-shaped thick protective sleeve, and the maximum length of the telescopic components is greater than the radius of the L-shaped thick protective sleeve.

[0017] Preferably, the telescopic assembly includes a support bar located inside the L-shaped thick protective sleeve, a fixed guide column is movably installed inside the support bar, one end of the fixed guide column is fixedly connected to the inner wall of the L-shaped thick protective sleeve, and a connecting spring is fixedly installed on one side of the support bar, and the connecting spring is fixedly connected to the inner wall of the L-shaped thick protective sleeve.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. A photovoltaic string dust accumulation rate measuring device described in the present invention adjusts the angle of the upper photovoltaic panel group and the lower photovoltaic panel group through an adjusting component. At this time, the upper photovoltaic panel group and the lower photovoltaic panel group are tilted as a whole. The tilt angle at this time is different from the first tilt angle. At this time, data measurement is performed. The first set of data is the total power generation efficiency of the first inverter and the second inverter that are cleaned every day, and the second set of data is the total power generation efficiency of the first inverter and the second inverter that are not cleaned. The dust accumulation rate of this inclination angle is obtained through the two sets of data. By comparing the dust accumulation rates of the upper photovoltaic panel group and the lower photovoltaic panel group at two different inclination angles, the influence of the upper photovoltaic panel group and the lower photovoltaic panel group on the dust accumulation rate under different inclination states is determined.

[0020] 2. A photovoltaic string dust accumulation rate measuring device described in the present invention is configured such that a first group of string bars are arranged at the bottom end of a lower photovoltaic panel group. When the upper photovoltaic panel group and the lower photovoltaic panel group are tilted as a whole under the action of an adjusting component, the center of the whole is at the rotation axis, and the first group of string bars are arranged at the bottom end of the lower photovoltaic panel group closest to the sliding column. When the lower photovoltaic panel group rotates, the rotation amplitude of the first group of string bars is minimal, so the pulling effect on the lower photovoltaic wiring harness is minimal, so that the lower photovoltaic wiring harness can always be inside the Z-shaped protective sleeve and protected by the Z-shaped protective sleeve.

[0021] 3. The photovoltaic string dust accumulation rate measuring device described in the present invention adjusts the rotation angle of the upper string protective part through the stabilizing block, and the electric telescopic column extends to allow the L-shaped thick protective cover to rise. At this time, the part of the L-shaped protective cover originally inside the L-shaped thick protective cover is exposed, but it does not affect the protection of the upper photovoltaic wiring harness at this position. After the thin protective cover rises, it docks with the second group of string bars to provide all-round protection for the upper photovoltaic wiring harness again. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is an overall stereogram of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of the upper photovoltaic panel group and the lower photovoltaic panel group in the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the adjustment component in the present invention;

[0026] Figure 4 It is a three-dimensional schematic diagram of the lifting assembly in the present invention;

[0027] Figure 5 It is a three-dimensional schematic diagram of the fixing assembly in the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the Z-shaped protective sleeve in the present invention;

[0029] Figure 7 It is a three-dimensional schematic diagram of the upper string protection member in the present invention;

[0030] Figure 8 It is a side plan view schematic diagram of the upper string protection member in the present invention;

[0031] Fig. 9 It is a three-dimensional schematic diagram of the telescopic component in the present invention.

[0032] In the figure: 1, adjustment assembly; 11, tilting bar; 111, through-bar groove; 12, fixing assembly; 121, U-shaped column; 122, rotating shaft; 123, rotating bar; 124, U-shaped fixing block; 13, lifting assembly; 131, U-shaped member; 132, sliding column; 133, extension column; 2, upper photovoltaic panel group; 21, second group of string bars; 22, upper photovoltaic wiring harness; 3, lower photovoltaic panel group; 31, first group of string bars ; 32. Lower photovoltaic wiring harness; 4. Upper string protection piece; 41. Thin protective cover; 42. L-shaped thick protective cover; 43. Electric telescopic column; 44. L-shaped protective cover; 45. Fixed groove; 46. Telescopic assembly; 461. Support bar; 462. Fixed guide column; 463. Connecting spring; 5. First inverter; 6. Lower string protection piece; 61. Z-shaped protective cover; 7. Second inverter; 8. Fixed bar; 9. Stabilizing block. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Embodiment 1

[0035] like Figure 1-2As shown, a photovoltaic string dust accumulation rate measuring device according to an embodiment of the present invention comprises an upper photovoltaic panel group 2 and a lower photovoltaic panel group 3, a first inverter 5 and a second inverter 7 are installed on one side of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 respectively, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are fixedly installed on the upper side of the adjustment component 1, an upper group string protection member 4 is installed on one side of the upper photovoltaic panel group 2, and a lower group string protection member 6 is installed on one side of the lower photovoltaic panel group 3;

[0036] A plurality of fixing bars 8 are installed on the lower sides of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3, and the lower sides of the plurality of fixing bars 8 are fixedly connected to the adjustment component 1; a first group of string bars 31 are fixedly installed on the lower side of the upper photovoltaic panel group 2, a lower photovoltaic wiring harness 32 is installed inside the first group of string bars 31, and the lower photovoltaic wiring harness 32 is electrically connected to the lower photovoltaic panel group 3; a second group of string bars 21 are fixedly installed on the lower side of the upper photovoltaic panel group 2, an upper photovoltaic wiring harness 22 is installed inside the second group of string bars 21, and the upper photovoltaic wiring harness 22 is electrically connected to the upper photovoltaic panel group 2; the second group of string bars 21 and the first group of string bars 31 are fixedly connected to the adjustment component 1.

[0037] Specifically, by adjusting the adjustment component 1, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are tilted as a whole, and the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are acted on by means of dust removal, so that the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are kept clean every day. At this time, the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is measured by the first inverter 5 and the second inverter 7, that is, the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is detected without the influence of dust. After this detection, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are no longer checked. The first inverter 5 and the second inverter 7 are used to measure the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3. First, the total power generation efficiency of the two times is compared. The total power generation efficiency of the first time is greater than the total power generation efficiency of the second time. The missing power generation efficiency is caused by dust. The overall dust accumulation rate of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is determined by dividing the missing power generation efficiency by the total power generation efficiency of the first time. The same method is used as above. The power generation efficiency of the second second inverter 7 can be used to determine the dust accumulation rate of the lower photovoltaic panel group 3. In the same way as above, the dust accumulation rate of the upper photovoltaic panel group 2 can be determined according to the power generation efficiency of the first first inverter 5 and the second first inverter 5. The upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 have the same inclination angle, but different heights. The influence of different heights on the dust accumulation rate can be confirmed based on the measured dust accumulation rate. The angle of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is adjusted by adjusting the component 1. At this time, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are one The whole is tilted, and the tilt angle at this time is different from the first tilt angle. Two groups of data are obtained in the same way. The first group of data is the total power generation efficiency of the first inverter 5 and the second inverter 7 which are cleaned every day, and the second group of data is the total power generation efficiency of the first inverter 5 and the second inverter 7 which are not cleaned. The dust accumulation rate of this tilt angle is obtained by the two groups of data. By comparing the dust accumulation rates of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 at two different tilt angles, the influence of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 on the dust accumulation rate under different tilt angles is determined.

[0038] like Figure 2-5As shown, the adjustment component 1 includes a tilting bar 11 fixedly connected to a plurality of fixed bars 8, and a fixed component 12 and a lifting component 13 installed on the lower side of the tilting bar 11. A through-bar groove 111 is opened inside the tilting bar 11. The lifting component 13 includes a telescopic column 133 and a U-shaped part 131 fixedly installed on the upper end of the telescopic column 133. A sliding column 132 is installed inside the U-shaped part 131. The sliding column 132 is located inside the through-bar groove 111. The fixed component 12 includes a U-shaped column 121 and a rotating shaft 122 movably installed inside the U-shaped column 121. A rotating bar 123 is movably installed inside the U-shaped column 121. The rotating bar 123 is movably installed inside the U-shaped column 121 through the rotating shaft 122. A U-shaped fixing block 124 is fixedly installed on the upper end of the rotating bar 123. The U-shaped fixing block 124 is fixedly installed on the corresponding tilting bar 11.

[0039] Specifically, multiple fixed bars 8 and the second group of string bars 21 and the first group of string bars 31 are all installed on the sides of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3, that is, they form a whole. However, when the angle of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 needs to be increased, the extension column 133 is extended to drive the U-shaped part 131 and the sliding column 132 to rise, so that the sliding column 132 moves away from the fixed component 12 inside the through-bar groove 111. At the same time, the tilting bar 11 is tilted together with the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3. At this time, the rotating bar 123 rotates outside the rotating shaft 122, and the U-shaped fixed block 124 is always fixedly connected to the tilting bar 11, that is, the tilt angle of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is increased, so as to facilitate the subsequent measurement of the dust accumulation rate.

[0040] like Figure 6 As shown, the lower string protection member 6 includes a Z-shaped protection sleeve 61 , which is used to protect the lower photovoltaic wiring harness 32 , and one end of the lower photovoltaic wiring harness 32 is electrically connected to the second inverter 7 .

[0041] Specifically, the first group of string bars 31 is arranged at the bottom end of the lower photovoltaic panel group 3. When the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are tilted as a whole under the action of the adjustment component 1, the center of the whole is at the rotating shaft 122, and the first group of string bars 31 is arranged at the bottom end of the lower photovoltaic panel group 3 at a position closest to the sliding column 132. When the lower photovoltaic panel group 3 rotates, the rotation amplitude of the first group of string bars 31 is the smallest, so the pulling effect on the lower photovoltaic wiring harness 32 is minimized, so that the lower photovoltaic wiring harness 32 can always be inside the Z-shaped protective sleeve 61 and protected by the Z-shaped protective sleeve 61.

[0042] like Figure 7-8As shown, the upper string protection member 4 includes an L-shaped thick protective sleeve 42 and an L-shaped protective sleeve 44 movably installed at the lower end of the L-shaped thick protective sleeve 42, one end of the L-shaped protective sleeve 44 is embedded in the lower end of the L-shaped thick protective sleeve 42, and a thin protective sleeve 41 is fixedly installed at one end of the L-shaped thick protective sleeve 42. The upper photovoltaic wiring harness 22 is located inside the thin protective sleeve 41, the L-shaped thick protective sleeve 42 and the L-shaped protective sleeve 44. Two electric telescopic columns 43 are fixedly installed at the lower end of the L-shaped thick protective sleeve 42, and the two electric telescopic columns 43 are located at the upper end of the L-shaped protective sleeve 44. On the outside, two electric telescopic columns 43 are used for the overall lifting and lowering of the L-shaped thick protective cover 42. A fixing groove 45 is opened inside the L-shaped protective cover 44. The thickness of the fixing groove 45 is consistent with the upper photovoltaic wiring harness 22. The upper photovoltaic wiring harness 22 is fixedly installed inside the fixing groove 45. A plurality of telescopic components 46 are installed inside the L-shaped thick protective cover 42. The plurality of telescopic components 46 are staggered inside the L-shaped thick protective cover 42. The maximum length of the telescopic component 46 is greater than the radius of the L-shaped thick protective cover 42. A stabilizing block 9 is movably installed on the outside of the L-shaped protective cover 44.

[0043] Specifically, when the inclination angle of the lower photovoltaic panel group 3 is low, the horizontal height of the upper photovoltaic harness 22 is low. At this time, the upper photovoltaic harness 22 is inside the thin protective sleeve 41, the L-shaped thick protective sleeve 42 and the L-shaped protective sleeve 44, and the upper photovoltaic harness 22 is protected. At this time, the staggered and extended telescopic components 46 inside the L-shaped thick protective sleeve 42 will all resist the upper photovoltaic harness 22. The upper photovoltaic harness 22 presents a concave and convex path state inside the L-shaped thick protective sleeve 42. When the inclination angle of the lower photovoltaic panel group 3 is increased by adjusting the component 1, the upper photovoltaic harness 22 is in a state of being ... When the angle is reached, the second group of strings 21 will rise and move toward the direction of the fixed component 12, thereby pulling one end of the upper photovoltaic harness 22 to present a concave and convex path state. The upper photovoltaic harness 22 will be straightened. At this time, the upper photovoltaic harness 22 is in the center of the L-shaped thick protective sleeve 42, and multiple groups of telescopic components 46 are compressed. More parts of the upper photovoltaic harness 22 are exposed outside the L-shaped thick protective sleeve 42 to facilitate the cooperation with the lower photovoltaic panel group 3 after rotation. However, at this time, the upper photovoltaic harness 22 is exposed outside and will The L-shaped thick protective sleeve 42 is raised by extending the electric telescopic column 43. At this time, the L-shaped protective sleeve 44 is exposed in the position inside the L-shaped thick protective sleeve 42, but it does not affect the protection of the upper photovoltaic wiring harness 22 at this position. After the thin protective sleeve 41 rises, it continues to dock with the second group of strings 21, and performs all-round protection on the upper photovoltaic wiring harness 22 again. At this time, the telescopic component 46 inside the L-shaped thick protective sleeve 42 resumes the extended state, so that the upper photovoltaic wiring harness 22 inside the L-shaped thick protective sleeve 42 presents a concave and convex path state, but the degree of concave and convex of the upper photovoltaic wiring harness 22 is not as good as the initial degree. When the inclination angle of the lower photovoltaic panel group 3 is changed, a following upper photovoltaic wiring harness 22 protection structure is set to avoid the upper photovoltaic wiring harness 22 becoming an influencing factor when the dust accumulation rate is measured, thereby increasing the accuracy of data measurement.

[0044] Embodiment 2

[0045] like Fig. 9 As shown, compared with Example 1, another implementation of the present invention is: the telescopic component 46 includes a resisting strip 461 located inside the L-shaped thick protective sleeve 42, a fixed guide column 462 is movably installed inside the resisting strip 461, one end of the fixed guide column 462 is fixedly connected to the inner wall of the L-shaped thick protective sleeve 42, and a connecting spring 463 is fixedly installed on one side of the resisting strip 461, and the connecting spring 463 is fixedly connected to the inner wall of the L-shaped thick protective sleeve 42.

[0046] Specifically, the upper photovoltaic wiring harness 22 presents a concave and convex path state inside the L-shaped thick protective sleeve 42. At this time, a connecting spring 463 provided in a telescopic component 46 is in a natural state, and the lower end of the pressing bar 461 presses against the upper photovoltaic wiring harness 22, and the pressing bar 461 is installed at the upper end of the L-shaped thick protective sleeve 42, but the lower end of the pressing bar 461 is at the inner bottom of the L-shaped thick protective sleeve 42, that is, at this time, the upper photovoltaic wiring harness 22 is pressed and presents a concave state, and an adjacent telescopic component 46 is installed at the lower end of the L-shaped thick protective sleeve 42, but the upper end of the pressing bar 461 presses against the upper photovoltaic wiring harness 22, and the upper end of the pressing bar 461 is at the inner top of the L-shaped thick protective sleeve 42, so that the upper photovoltaic wiring harness 22 is pressed and presents a concave state. The photovoltaic wiring harness 22 is held against and presents a convex state, and the fixed guide column 462 plays a guiding role, so the upper photovoltaic wiring harness 22 presents a concave-convex path state and is folded inside the L-shaped thick protective sleeve 42. When the inclination angle of the lower photovoltaic panel group 3 changes, the upper photovoltaic wiring harness 22 inside the L-shaped thick protective sleeve 42 is stretched, and when the rising thin protective sleeve 41 is re-connected with the second group of string strips 21 and the exposed upper photovoltaic wiring harness 22 is re-protected, the degree of folding of the upper photovoltaic wiring harness 22 inside the L-shaped thick protective sleeve 42 becomes smaller, that is, the degree of concave and convex becomes slower. When the inclination angle of the lower photovoltaic panel group 3 is changed to determine the dust accumulation rate, the wiring harness of the photovoltaic string is still protected.

[0047] Working principle: by adjusting the adjustment component 1, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are tilted as a whole, and the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are acted on by means of dust removal, so that the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are kept clean every day. At this time, the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is measured by the first inverter 5 and the second inverter 7, that is, the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is detected without the influence of dust. After this detection, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are no longer measured. The upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are deashed. After the same number of days as the last detection, the power generation efficiency of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is measured by the first inverter 5 and the second inverter 7. First, the total amount of the two power generation efficiencies is compared. The total amount of the first power generation efficiency is greater than the total amount of the second power generation efficiency. The missing power generation efficiency is caused by dust. The overall dust accumulation rate of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 is determined by dividing the missing power generation efficiency by the total amount of the first power generation efficiency. The same as above. According to the above method, the dust accumulation rate of the lower photovoltaic panel group 3 can be determined according to the power generation efficiency of the first second inverter 7 and the second second inverter 7. With the above method, the dust accumulation rate of the upper photovoltaic panel group 2 can be determined according to the power generation efficiency of the first first inverter 5 and the second first inverter 5. The upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 have the same inclination angle, but different heights. The influence of the height difference on the dust accumulation rate can be confirmed according to the measured dust accumulation rate. The upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are angle-adjusted by adjusting the adjustment component 1. At this time, the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 are tilted as a whole. The tilt angle at this time is different from the first tilt angle. Two sets of data are obtained in the same way. The first set of data is the total power generation efficiency of the first inverter 5 and the second inverter 7 that are cleaned every day, and the second set of data is the total power generation efficiency of the first inverter 5 and the second inverter 7 that are not cleaned. The dust accumulation rate of this inclination angle is obtained by the two sets of data, and the dust accumulation rates of the upper photovoltaic panel group 2 and the lower photovoltaic panel group 3 with different inclination angles are compared.

[0048] When the inclination angle of the lower photovoltaic panel group 3 is low, the horizontal height of the upper photovoltaic harness 22 is low. At this time, the upper photovoltaic harness 22 is inside the thin protective cover 41, the L-shaped thick protective cover 42 and the L-shaped protective cover 44, and the upper photovoltaic harness 22 is protected. At this time, the staggered and extended telescopic components 46 inside the L-shaped thick protective cover 42 will all resist the upper photovoltaic harness 22. The upper photovoltaic harness 22 presents a concave and convex path state inside the L-shaped thick protective cover 42. When the inclination angle of the lower photovoltaic panel group 3 is increased by adjusting the component 1, the upper photovoltaic harness 22 is in a state of being concave and convex. When the angle is reached, the second group of strings 21 will rise and move toward the direction of the fixed component 12, thereby pulling one end of the upper photovoltaic harness 22, presenting a concave and convex path state. The upper photovoltaic harness 22 will be straightened. At this time, the upper photovoltaic harness 22 is in the center of the L-shaped thick protective sleeve 42, and multiple groups of telescopic components 46 are compressed. More parts of the upper photovoltaic harness 22 are exposed outside the L-shaped thick protective sleeve 42 to facilitate the cooperation with the lower photovoltaic panel group 3 after rotation. However, at this time, the upper photovoltaic harness 22 is exposed on the outside of the L-shaped thick protective sleeve 42. The outer side will be easily damaged. The rotation angle of the upper group string protection member 4 is adjusted by the stabilizing block 9, so that one end of the thin protective sleeve 41 is in the same vertical line with the second group of string bars 21 at this time, and then the L-shaped thick protective sleeve 42 is raised by extending the electric telescopic column 43. At this time, the L-shaped protective sleeve 44 is originally exposed in the position inside the L-shaped thick protective sleeve 42, but it does not affect the protection of the upper photovoltaic wiring harness 22 at this position. After the thin protective sleeve 41 rises, it continues to dock with the second group of string bars 21, and the upper photovoltaic wiring harness 22 is fully protected again. At this time, the telescopic component 46 inside the L-shaped thick protective sleeve 42 resumes the extended state, so that the upper photovoltaic wiring harness 22 inside the L-shaped thick protective sleeve 42 presents a concave and convex path state, but at this time the concave and convex degree of the upper photovoltaic wiring harness 22 is not as good as the initial degree. When the inclination angle of the lower photovoltaic panel group 3 is changed, a following upper photovoltaic wiring harness 22 protection structure is set to avoid the upper photovoltaic wiring harness 22 becoming an influencing factor when the dust accumulation rate is measured.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A photovoltaic string dust accumulation rate measuring device, comprising an upper photovoltaic panel group (2) and a lower photovoltaic panel group (3), wherein a first inverter (5) and a second inverter (7) are installed on one side of the upper photovoltaic panel group (2) and the lower photovoltaic panel group (3), respectively, and characterized in that: The upper photovoltaic panel group (2) and the lower photovoltaic panel group (3) are fixedly mounted on the upper side of the regulating assembly (1); an upper string protection member (4) is mounted on one side of the upper photovoltaic panel group (2); and a lower string protection member (6) is mounted on one side of the lower photovoltaic panel group (3); A plurality of fixing bars (8) are installed on the lower sides of the upper photovoltaic panel group (2) and the lower photovoltaic panel group (3), and the lower sides of the plurality of fixing bars (8) are fixedly connected to the adjustment component (1); a first group of string bars (31) is fixedly installed on the lower side of the lower photovoltaic panel group (3), a lower photovoltaic wire harness (32) is installed inside the first group of string bars (31), and the lower photovoltaic wire harness (32) is electrically connected to the lower photovoltaic panel group (3); a second group of string bars (21) is fixedly installed on the lower side of the upper photovoltaic panel group (2), an upper photovoltaic wire harness (22) is installed inside the second group of string bars (21), and the upper photovoltaic wire harness (22) is electrically connected to the upper photovoltaic panel group (2); the second group of string bars (21) and the first group of string bars (31) are fixedly connected to the adjustment component (1); The upper string protection member (4) comprises an L-shaped thick protective sleeve (42) and an L-shaped protective sleeve (44) movably mounted at the lower end of the L-shaped thick protective sleeve (42); one end of the L-shaped protective sleeve (44) is embedded in the lower end of the L-shaped thick protective sleeve (42); one end of the L-shaped thick protective sleeve (42) is fixedly mounted with a thin protective sleeve (41); the upper photovoltaic wiring harness (22) is located inside the thin protective sleeve (41), the L-shaped thick protective sleeve (42) and the L-shaped protective sleeve (44); the L-shaped thick protective sleeve (42) and the L-shaped protective sleeve (44) form a Z-shaped component; Two electric telescopic columns (43) are fixedly mounted on the lower end of the L-shaped thick protective sleeve (42), and the two electric telescopic columns (43) are located outside the upper end of the L-shaped protective sleeve (44). When the two electric telescopic columns (43) are extended, the L-shaped thick protective sleeve (42) rises, and at this time, the portion of the L-shaped protective sleeve (44) that was originally inside the L-shaped thick protective sleeve (42) is exposed; A fixing groove (45) is provided inside the L-shaped protective sleeve (44), the thickness of the fixing groove (45) being consistent with that of the upper photovoltaic wiring harness (22), the upper photovoltaic wiring harness (22) being fixedly mounted inside the fixing groove (45), and a stabilizing block (9) is movably mounted outside the L-shaped protective sleeve (44), and the rotation angle of the upper string protective member (4) is adjusted by means of the stabilizing block (9).

2. A photovoltaic string dust accumulation rate measuring device according to claim 1, characterized in that: The adjustment assembly (1) comprises an inclined bar (11) fixedly connected to a plurality of fixed bars (8), and a fixed assembly (12) and a lifting assembly (13) mounted on the lower side of the inclined bar (11); a through-bar groove (111) is provided inside the inclined bar (11).

3. A photovoltaic string dust accumulation rate measuring device according to claim 2, characterized in that: The lifting assembly (13) comprises an extending and lowering column (133) and a U-shaped member (131) fixedly mounted on the upper end of the extending and lowering column (133); a sliding column (132) is mounted inside the U-shaped member (131); and the sliding column (132) is located inside the through-slot (111).

4. A photovoltaic string dust accumulation rate measuring device according to claim 2, characterized in that: The fixing assembly (12) comprises a U-shaped column (121) and a rotating shaft (122) movably mounted inside the U-shaped column (121); a rotating bar (123) is movably mounted inside the U-shaped column (121); the rotating bar (123) is movably mounted inside the U-shaped column (121) via the rotating shaft (122); a U-shaped fixing block (124) is fixedly mounted on the upper end of the rotating bar (123); and the U-shaped fixing block (124) is fixedly mounted on the corresponding tilting bar (11).

5. A photovoltaic string dust accumulation rate measuring device according to claim 1, characterized in that: The lower string protection member (6) comprises a Z-shaped protection sleeve (61), the Z-shaped protection sleeve (61) being used to protect the lower photovoltaic wiring harness (32), one end of the lower photovoltaic wiring harness (32) being electrically connected to the second inverter (7).

6. A photovoltaic string dust accumulation rate measuring device according to claim 1, characterized in that: A plurality of telescopic components (46) are installed inside the L-shaped thick protective sleeve (42), and the plurality of telescopic components (46) are staggeredly distributed inside the L-shaped thick protective sleeve (42), and the maximum length of the telescopic components (46) is greater than the radius of the L-shaped thick protective sleeve (42).

7. A photovoltaic string dust accumulation rate measuring device according to claim 6, characterized in that: The telescopic assembly (46) comprises a support bar (461) located inside the L-shaped thick protective sleeve (42), a fixed guide column (462) being movably installed inside the support bar (461), one end of the fixed guide column (462) being fixedly connected to the inner wall of the L-shaped thick protective sleeve (42), and a connecting spring (463) being fixedly installed on one side of the support bar (461), and the connecting spring (463) being fixedly connected to the inner wall of the L-shaped thick protective sleeve (42).

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